The category B3 licence does not include any A subcategory. Nevertheless, this does not prevent the B3 licence holder from releasing maintenance tasks typical of the A1.2 subcategory for piston-engine non-pressurized aeroplanes of 2000 Kg MTOM and below, within the limitations contained in the B3 licence.

A category B3 aircraft maintenance licence shall permit the holder to issue certificates of release to service and to act as B3 support staff for : - maintenance performed on aeroplane structure, powerplant and mechanical and electrical systems, - work on avionic systems requiring only simple tests to prove their serviceability and not requiring troubleshooting.